Synthesis and crystal structures of new dioxouranium(VI) complexes based on carbacylamidophosphates (CAPh). Investigation of extraction properties of some CAPh ligands in respect of dioxouranium(VI) nitrate

New coordination compounds with the formulae UO2(NO3)2(HL1)2 (A), UO2(NO3)(L1)(HL1) (B) and UO2(L2)2(HL2) (C), where HL1 = Cl3CCONHP(O)(N(CH2)5)2, HL2 = Cl3CCONHP(O)(N(Et)2)2, were synthesized and characterized by means of 1H NMR and IR spectroscopy, and X-ray diffraction analysis. It was found that in A the ambidentate HL1 ligands coordinate to the dioxouranium(VI) cations in the neutral form in a monodentate manner via the oxygen atom of the phosphoryl group, by analogy with the previously described UO2(NO3)2(HL2)2 (D), UO2(NO3)2(HL3)2 (E) and UO2(NO3)2(HL4)2 (F), where HL3 = Cl3CCONHP(O)(N(CH2)4)2 and HL4 = Cl3CCONHP(O)(N(Me)(Ph))2. In contrast, in B and C the ligands act in two modes, namely in the neutral HL1 (HL2) form with a monodentate coordination and in a deprotonated L1− (L2−) form with a bidentate coordination via the oxygen atoms of the phosphoryl and carbonyl groups, forming six-membered chelate cycles. The extraction of the dioxouranium(VI) nitrate from HNO3 solutions using HL1, HL2 and HL3 in toluene was carried out.

New coordination compounds of the formulae UO2(NO3)2(HL1)2, UO2(NO3)(L1)(HL1) and UO2(L2)2(HL2), where HL1 = Cl3CCONHP(O)(N(CH2)5)2 and HL2 = Cl3CCONHP(O)(N(Et)2)2, were synthesized and characterized by means of 1H NMR and IR spectroscopy and X-ray diffraction analysis. The extraction of dioxouranium(VI) nitrate from HNO3 solutions using HL1, HL2 and HL3 (Cl3CCONHP(O)(N(CH2)4)2) in toluene was carried out.Figure optionsDownload as PowerPoint slide